%I #11 Nov 01 2020 04:33:51
%S 1,6,12,28,30,56,72,117,120,132,180,182,306,360,380,496,552,672,702,
%T 775,792,840,870,992,1080,1092,1406,1440,1568,1584,1680,1722,1836,
%U 1892,2016,2160,2184,2256,2280,2793,2862,3276,3312,3510,3540,3600,3672,3696,3782,3960
%N Integers that can be expressed as a product d*sigma(d), where sigma is the sum of divisors function, in a single way.
%C Integers m such that A327153(m) = 1.
%H David A. Corneth, <a href="/A338520/b338520.txt">Table of n, a(n) for n = 1..10000</a>
%o (PARI) f(n) = sumdiv(n, d, d*sigma(d)==n); \\ A327153
%o isok(n) = f(n)==1;
%Y Cf. A000203, A064987, A327153, A337873.
%Y Subsequence of A327165.
%Y Subsequences: A000396 (perfect numbers), A036690 (p*(p+1)).
%Y Cf. A338519 (similar for number of divisors).
%K nonn
%O 1,2
%A _Michel Marcus_, Nov 01 2020